DataCenter Its a logical entity defining a set or resources.these set of resources include collection of number of clusters of Virtual meachines , Network and Sotrage. The datacenter is highest level of containment of all these resources ( physical and logical ) managed in virtual environment

Storage Its a abstracted view of the physical storage assigned to a data center.It is either iSCSI, or Fiber Channel, or NFS

Cluster set of physical hosts that are treated as a resource pool.Hosts in a cluster share the same network infrastructure and the same storage. When in a cluster virtual meachines can move from host to host

Hi after working for 3 years in M3-consulting i have been looking for a job change. I am looking for a job

in Data Centers where i can gain knowledge and also get maximum exposure. I have got calls from IBM,TCS,Oracle and Kanak, Hexagrid in Hyderabad in one of the interview they asked me how can you troubleshoot a network.

Here we go into the topic.

1- First check that your interface (Network adapter ) is enabled or not using:ifconfig

2- To make sure there is no internal problem.

ping to the loop back address ping 127.0.0.1

if there is no response service network restartif same repeats check network settings again.

3- check cable problem fromethtool eth0

if everything is fine then last line will show

Link detected: yes

if link is not detected plug it or change the cable according to need and problem

4-check the gateway settings in

/etc/network and

/etc/sysconfig/network-scripts/ifcfg-eth0

And check DNS settings in

/etc/resolv.conf

system-config-network

netstat

route

service iptables stop

( only disable the firewall for testing and dont forget to turn it on)

L The readline library must be linked into the shell to enable
this Feature.

Notes to the table above

1. This feature was not in the orginal version, but has since become
almost standard.
2. This feature is fairly new and so is often not found on many
versions of the shell, it is gradually making its way into
standard distribution.
3. The Vi emulation of this shell is thought by many to be
incomplete.
4. This feature is not standard but unoffical patches exist to
perform this.
5. A version called 'pdksh' is freely available, but does not have
the full functionality of the AT&T version.
6. This can be done via the shells programmable completion mechanism.
7. Only by specifing a file via the ENV environment variable.